Method of making adjustable spanners



July 4, 1933. J, F, CHOBERT 1,916,605

METHOD OF MAKING ADJUSTABLE SPANN-ERS Filed July 1, 1950 lllllllliii! MIfl/MIIIIIIIIIIIIIILWIIIII 61 C/loberf 5/ WZMLM 54 5;

Patented July 4, 193a UNITED R STATES PATENT OFFICE JACQUES FRANCOIS GABRIEL cno annr, or ST.-ETIE1\TNE, FRANCE METHOD or MAKING ADJUSTABLE enemas AppIicatiOn filed July 1, 1930, Serial No.

' The objectof the present invention is to provide improvements in the methodshith- Y erto employed for the manufacture of adcutting out and stamping flat sheets.

A further object of the invention is to obtain" stamped out spanners which are of great strength, particularly in the region of the jaw, so as to permit the spanner to stand up even if its jaw is completely engaged on the nut to be tightened. V

A still further object of the invention is to obtain adjustable spanners by a very simple and rapid method of manufacture, which is consequently of low cost compared with other methods, the spanners according to the,

invention comprising no rivets or screws or brazing or welding. r

. nother object of the invention is to per mit spanners to be manufactured with great accuracy. v

The object of the invention is finally'to produce spanners all the parts of which are,

formed of a metal of equal thickness, thus facilitating thefiheat treatment of the spanner after manufacture.

A methodpermitting the above-indicated objects to be attained consists in forming a jaw having two side platesfor an adjustable spanner by cutting out, folding'and stamp- --ing a fiat sheet in a single p1ece.

This fiat sheet or plate is cut out in such a way that the two side plates are connected together by, the part of the metal corresponding to the nose of the jaw.

. This plate is then stamped out and folded along a line passing through this same part of the metal.

Consequently the nose of the jaw is formed at least over the part of this nose which profjects beyond the body of the jaw'by a continuous sheet of metal simply folded along its line of symmetry and the two lips of which are connected to each other by the metal of 5 the plate itself without the use of rivets or 465,230, and in France August 8, 1929.

welding. A spanner is consequently obtained which possesses an excellent mechanical strength, as will be explained hereinafter in detail.

The folding and stamping operation is advantageously effected in such a way as to give the part of the nose of the jaw projecting beyond the body of this jaw a channelshaped or similar section.

According to a modification of this meth- 0d, the plate is folded and stamped out along a line passing through the-part of the metal which corresponds to the nose of the jaw,

and filling means are forced between the'two cheeks of the nose of the'jaw so as toform a solid nose having a large contact surface with the screw to be tightened;

These filling means are advantageously formed by a core which is lodged between the form a solid jaw. I

A spanner in conformityzwith the inven- I tion presentsthe features which stand out from the following description and chiefly the claims appended at the end of this descript-ion.

' The preferred form of a spanner according to the invention is shown by way of example in the accompanying drawing, which permits this spanner and its method of manufacture to be described at the same time.

In this drawing:

Figure 1 is an-elevationof an adjustable spanner according to the invention.

, Figure 2' is a perspective view of the fixed jaw of this spanner; I

Figure 3 is a perspective view of the completed movable aw. Y I

Figure 4; is a plan View of the plate from which this movable jaw is made.

Figure5 shows an elevationand end views of the wedge adapted to fill the nose of the movable jaw.

The adjustable spanner comprises a-fixed jaw 3, a movable j aw 1 and operating members interposed between these two jaws.

The'fixed aw 3, which is shown completed in Figure 2, comprises a supporting lug 10 the height of which is such'that the head of the, movable jaw presses upon this lug over the whole of its height for the mean opening of the spanner, thus preventing any yielding of the movable jaw 1 and increasing the strength of the spanner.

The fixed jaw 3 comprises a slot 12 which receives the clamping screw 13 carrying the adjusting nut 1i.

The movable jaw 1 (Figure 6) is made of a single piece of metal. It comprises a nose 81 81 and two side plates 2 2 provided with slots 31 31 in whichthe nut 14 engages. Consequently the rotation ofthis nut and its movement alon the screw 13permits the movable jaw 1 and the fixed jaw 3 to be moved together or separated from each other, and permits the distance between the jaws to be'regulated so as to engage the nut to be unscrewed and the jaws to be then clamped on this nut. The movable jaw 1 is manufao t'ured according to the inventionin the following manner.

A flat plate 80 (Figure 4) is first cut out, comprising two arms or extensions 2 2 corresponding to t ie two side plates of the movable jaw 1 and comprising slots 31 31 .for receiving the adjusting nut 14. These two extensions are connected to'each other by a portion of metal 81 81 which corre sponds to the nose of the jaw. They form between them a recess 82 for the passage of the fixed jaw 3 when the spanner is mounted.

The plate 80 thus cut out is stamped out,

the two halves 2, 2 of the plate 80 being folded along the line of symmetry 0, y, pass ing through .thepart of the metal which forms the beak of the jaw and projects beyond the body'of this aw, this line being situated along the direction of length of this After heating and folding the two side plates 2 ,2 of the movable jaw are parallel and rigidly connected with each other by the continuity of the metal forming the beak 81 81 of the movable jaw. adopted a U-shaped or channel section (Fig. which assists in giving it greater rigidity. In order to complete the movable jaw 1 a wedge 82 (Figure 8) is inserted between the cheeks 81 81 ofthe'beak and held in position between these cheeks by clamping in a'pres's, .for example. This wedge is not inserted in order to increase the strength'or solidity which is obtained bythe folding operation according to the invention, but is done in order to increase the bearingsurface of the nut so as to reduce the pressureand consequently to avoid damaging the nuts.

The method of manufacture of the movablejaw described above presents numerous technical advantages and in. particular the following:

(a) Great Streagth;-The two lips 81 8g of the nose are connected to each other by a continuous sheet of metal which is folded along the line of symmetry 00, y (Figure 7) This nose has thus.

rivets, which run a danger of being sheared,

particularly when the jaw is incompletely engaged over a nut.

(b) Simplicity of maaufactwe.The method according to the invention is much more simple than the known methods, because it requires neither rivets nor screws, nor the complicated mounting of known methods.

It permits a spanner to be obtained which has the same strength and the same appearance as if the jaw had been milled out of a piece of forged steel. V

V (0) Accuracy of manwfa0ture.-The suppression of the accessory operations of welding, brazing, etc, avoids any deformation of the movable aw, which might detract from the accuracy of its manufacture;

What I claim is: 1. A method of manufacture of adj ustable spanner-s, one of the jaws of which comprises.

two parallel side-plates, the said method consisting in cutting out a flat plate comprising two extensions. which correspond to the side-plates of the jaw and which are connected to each other by the part of the.

metal which corresponds to the nose of this aw and throughout thelengthof th1s nose projects beyond the body of the jaw and corresponds only to the workingzone of this aw, said method alsoconslstmg 1n pressing and folding this plate subsequently along a line passing-through this part of the metal. 2--A methodof manufacture of adjustable spanners, one of the jaws of which comprises two parallel side-plates, the said method consisting in cuttingout a flat plate I comprising two extensions whlch correspond to the side-plates of the 121W and which are connected to each other by the part of the metal which-corresponds to the nose of this jaw and throughout-the length of this nose projects beyond the body of the jaw and corresponds only to the working zone of'this jaw, said method also consisting in pressing and folding this plate subsequently along a line passing through this part of the metal,

this folding and pressing operation being;-

effected in such a manner asto give the part of the. nose of the aw projecting. beyond the body of the latter a U-shapedsection.

3. A method of manufacture of adjustable spanner-s, one of the aws of which comprises two parallelside-plates, the said'method consisting in cutting out a fiat plate comprising two extensions which correspond to the sideplates of thejaw and which are connected to eachother-by the part of the metal which i corresponds to the nose of this jaw and throughout the length of this nose projects beyond the body of the jaw and corresponds only to the working zone of this jaw, said method also consisting in pressing and folding this .plate subsequently along a line passing through this part of the metal, in c ging a core between the two cheeks of the JACQUES FRANCOIS GABRIEL CHOBERT. 

